diff --git a/cmd/config.go b/cmd/config.go
index ee7ac9a..4b4902f 100644
--- a/cmd/config.go
+++ b/cmd/config.go
@@ -46,6 +46,7 @@ type serverConfig struct {
 	ReceiveWindowClient uint64 `json:"recv_window_client"`
 	MaxConnClient       int    `json:"max_conn_client"`
 	DisableMTUDiscovery bool   `json:"disable_mtu_discovery"`
+	IPv6Only            bool   `json:"ipv6_only"`
 }
 
 func (c *serverConfig) Check() error {
diff --git a/cmd/server.go b/cmd/server.go
index 828fd83..f5d7a44 100644
--- a/cmd/server.go
+++ b/cmd/server.go
@@ -128,6 +128,10 @@ func server(config *serverConfig) {
 	if len(config.Obfs) > 0 {
 		obfuscator = obfs.NewXPlusObfuscator([]byte(config.Obfs))
 	}
+	// IPv6 only mode
+	if config.IPv6Only {
+		transport.DefaultTransport = transport.IPv6OnlyTransport
+	}
 	// ACL
 	var aclEngine *acl.Engine
 	if len(config.ACL) > 0 {
diff --git a/pkg/transport/transport.go b/pkg/transport/transport.go
index 8bcd407..fc48a6f 100644
--- a/pkg/transport/transport.go
+++ b/pkg/transport/transport.go
@@ -22,6 +22,12 @@ var DefaultTransport Transport = &defaultTransport{
 	Timeout: 8 * time.Second,
 }
 
+var IPv6OnlyTransport Transport = &ipv6OnlyTransport{
+	defaultTransport{
+		Timeout: 8 * time.Second,
+	},
+}
+
 type defaultTransport struct {
 	Timeout time.Duration
 }
@@ -67,3 +73,11 @@ func (t *defaultTransport) LocalListenTCP(laddr *net.TCPAddr) (*net.TCPListener,
 func (t *defaultTransport) LocalListenUDP(laddr *net.UDPAddr) (*net.UDPConn, error) {
 	return net.ListenUDP("udp", laddr)
 }
+
+type ipv6OnlyTransport struct {
+	defaultTransport
+}
+
+func (t *ipv6OnlyTransport) LocalResolveIPAddr(address string) (*net.IPAddr, error) {
+	return net.ResolveIPAddr("ip6", address)
+}